More room for the life you have.
Bedrooms, master suites, family rooms, sunrooms, and second-story additions — seamless expansions that enhance your home’s space, functionality, and value, from concept to completion.
Additions that read as original to the house.
The two ways an addition goes wrong: it looks added, or it stalls in permitting. Both are solved before construction — in design that matches the original architecture, and in complete drawings that clear plan check the first time.
Our specialists begin with an in-depth site evaluation — vision, space requirements, structural integrity, zoning, and budget — then produce architectural layouts and 3D renderings where the new space blends seamlessly with the old.
Construction runs from foundation and framing through electrical, plumbing, and finish, under one project manager, with financing options available to spread the investment.
Typical cost & timeline by addition type.
Real ranges from our completed projects. Base pricing starts around $50 per square foot and rises with complexity.
| Addition type | Typical cost | Timeline | Notes |
|---|---|---|---|
| Bedroom / office addition | $40,000–$100,000 | 3–5 months | Single-story, standard systems |
| Master suite addition | $80,000–$180,000 | 4–6 months | Bed + bath + closet |
| Family room / sunroom | $50,000–$120,000 | 3–5 months | Light, open, connected |
| Second-story addition | $150,000+ | 6–12 months | Structural reinforcement required |
Most room additions require permits to meet local building codes — we handle them all. Financing options are available so you don’t need the full amount up front.
For households that outgrew the floor plan.
An addition keeps everything you like — the street, the schools, the mortgage rate — and fixes the one thing you don’t: the size.
These are the additions we build most.
Craft you can hold us to.
Design-build, one roof
Architects, designers, and builders on one team — from 3D renderings and permits to the final walkthrough, with no handoffs and no finger-pointing.
Free 3D design session
A free in-home design session with 3D renderings — a $3,000–$5,000 value when you build with us — so you see the space before a wall moves.
One accountable team
A 25-person team led by the same family since 1996 — with a dedicated project manager, regular updates, and a clean, organized site.
Everything, handled.
Design & 3D renderings
Layouts that blend seamlessly with your existing home, visualized before anything is built.
Permits & structural
Zoning review, city permits, structural assessments, and engineering — managed end to end.
Foundation to finish
Framing, roofing tie-ins, and complete interior finish executed with precision by one crew.
Systems extension
Electrical, plumbing, and HVAC extended properly — with energy-efficient upgrades built in.
Planning a bigger project? Room Additions often pairs with ADU Construction, Garage Conversions, or Home Builder — we can scope it all together.
Problems we solve
- A house that fits the mortgage but no longer fits the family
- Additions that read as boxes bolted onto the original house
- No primary suite in a house full of people
- Moving costs that dwarf the cost of building the missing room
Common triggers
- A new baby, a move-in parent, or two careers working from home
- Loving the neighborhood too much to leave it
- A kitchen or living room bursting at every gathering
- Needing a private retreat the current floor plan can’t offer
What this service covers.
Every scope is different, but a room additions project with Preferred typically includes each of these.
Private retreats with bed, bath, and closet — the suite the house always needed.
Expanded footprints for more counter, storage, and gathering space.
More room for memories — open living space connected to the heart of the house.
Light-filled rooms with a view, engineered for year-round comfort.
Comfortable, private quarters for loved ones — close, but self-contained.
Purpose-built rooms for the way you work and train.
Unfinished attics transformed into bedrooms, studies, and hideaways.
Double the footprint without touching the yard — engineered from the foundation up.
Serving greater Los Angeles.
Common questions.
Ready to add the room you’re missing?
Get a free in-home design session — we’ll evaluate your site, sketch the options, and give you a detailed estimate.
(818) 312-6622